Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6221088920b988…

MALICIOUS

PDF

72.1 KB Created: 2021-05-13 20:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b7c2815e5c1d0b77890eaa4a224acfda SHA-1: e1cf43ced8896dd8bbfd2c6237317f10d6037b67 SHA-256: 3a6221088920b988736c8d4170f1cb79ae63c0538ef6407f80a81984d2b7b571
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document body, though partially corrupted, contains text related to a 'Vtech phone answering machine not working' and mentions urgency, aligning with phishing lures. The presence of external URIs, including one pointing to a PDF on a disposable hosting domain, suggests the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/strik?utm_term=vtech+phone+answering+machine+not+working PDF link annotation
    • http://xisumagogali.getenjoyment.net/nipetivedexepedelafode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382197/normal_60185b656d29e.pdfIn PDF document text
    • https://cdn.sqhk.co/nivodoruw/hc0idsk/16627818178.pdfIn PDF document text
    • http://zagupoxeson.iblogger.org/university_of_unisa_application_form_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/pukazibat/jcNheil/carpenter_ants_colony_cast.pdfIn PDF document text
    • http://toredakaf.22web.org/85013209447.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370540/normal_5ff52b60bd387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418167/normal_605136c109c8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468531/normal_60210f07d98c5.pdfIn PDF document text
    • https://cdn.sqhk.co/pelebitebi/UBhj04N/kitegupawelazadowigewe.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/eSTCEgj/satoji.pdfIn PDF document text
    • http://sumigemag.mywebcommunity.org/97604330098.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/haAmRgj/86187899398.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484093/normal_6065dc004699e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://beturibux.rf.gd/antecedentes_historicos_de_la_terapia_fisica.pdfIn PDF document text
    • http://mojadifo.rf.gd/povipijajepuzowiwevufef.pdfIn PDF document text
    • http://nunavaxukozu.onlinewebshop.net/kinupuz.pdfIn PDF document text
    • http://wegugoleta.onlinewebshop.net/carbono_anomerico.pdfIn PDF document text
    • http://pesetunal.onlinewebshop.net/how_to_get_started_with_my_kindle_paperwhite.pdfIn PDF document text
    • http://kisuneronebel.rf.gd/nexeditegefelimibiwegof.pdfIn PDF document text
    • http://natexaz.rf.gd/2014_maserati_granturismo_mc_stradale_0-60.pdfIn PDF document text
    • http://dudufimapu.epizy.com/vulet.pdfIn PDF document text
    • http://wojobawezelo.rf.gd/call_of_duty_pre_ps4.pdfIn PDF document text
    • http://tetaxejil.rf.gd/xamovufebixurerewawi.pdfIn PDF document text
    • https://2df275fc-a8dd-466e-be95-33fe0afe7bed.filesusr.com/ugd/9b6d1e_dbbd22e6dba64fc794698e2438c09f8a.pdf?index=trueIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_a8a32d0a6f5849f584792262cdf2aaeb.pdf?index=trueIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_b29ce979e1ee48a0b7402412bc7ef064.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC67 5436 bytes
SHA-256: 2d7c47d439b3faf8f9557be8b90c5da031970711ec3d1ccca6d570e27101f22c
font_01_sfnt_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 10320 bytes
SHA-256: c4fc5bc67bc8fb13c2c2dd0d63642ecc6526c5c28417ba914acaccdbcc96964c